\documentclass[standalone]{standalone}  % 关键：用 standalone 类
\usepackage{tikz, amssymb}
\tikzset{every picture/.style={line width=0.75pt}} 
\usepackage{tikz, amssymb} % 必须加载tikz宏包
\usepackage[utf8]{inputenc} % 支持特殊字符
\tikzset{every picture/.style={line width=0.75pt}} 

\begin{document}  

\begin{tikzpicture}[x=0.75pt,y=0.75pt,yscale=-1,xscale=1]
%uncomment if require: \path (0,300); %set diagram left start at 0, and has height of 300

%Straight Lines [id:da13872276280070495] 
\draw    (165,83) -- (184.59,63.41) ;
\draw [shift={(186,62)}, rotate = 135] [color={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]    (10.93,-3.29) .. controls (6.95,-1.4) and (3.31,-0.3) .. (0,0) .. controls (3.31,0.3) and (6.95,1.4) .. (10.93,3.29)   ;
%Straight Lines [id:da7892876350527525] 
\draw    (165,118) -- (184.59,98.41) ;
\draw [shift={(186,97)}, rotate = 135] [color={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]    (10.93,-3.29) .. controls (6.95,-1.4) and (3.31,-0.3) .. (0,0) .. controls (3.31,0.3) and (6.95,1.4) .. (10.93,3.29)   ;
%Straight Lines [id:da16172561449421907] 
\draw    (165,153) -- (184.59,133.41) ;
\draw [shift={(186,132)}, rotate = 135] [color={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]    (10.93,-3.29) .. controls (6.95,-1.4) and (3.31,-0.3) .. (0,0) .. controls (3.31,0.3) and (6.95,1.4) .. (10.93,3.29)   ;
%Straight Lines [id:da8790765193773139] 
\draw    (190,83) -- (209.59,63.41) ;
\draw [shift={(211,62)}, rotate = 135] [color={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]    (10.93,-3.29) .. controls (6.95,-1.4) and (3.31,-0.3) .. (0,0) .. controls (3.31,0.3) and (6.95,1.4) .. (10.93,3.29)   ;
%Straight Lines [id:da9551060413295623] 
\draw    (215,83) -- (234.59,63.41) ;
\draw [shift={(236,62)}, rotate = 135] [color={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]    (10.93,-3.29) .. controls (6.95,-1.4) and (3.31,-0.3) .. (0,0) .. controls (3.31,0.3) and (6.95,1.4) .. (10.93,3.29)   ;
%Straight Lines [id:da07116701826587579] 
\draw    (190,118) -- (209.59,98.41) ;
\draw [shift={(211,97)}, rotate = 135] [color={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]    (10.93,-3.29) .. controls (6.95,-1.4) and (3.31,-0.3) .. (0,0) .. controls (3.31,0.3) and (6.95,1.4) .. (10.93,3.29)   ;

% Text Node
\draw (112,43.4) node [anchor=north west][inner sep=0.75pt]    {$A_{1} =\{a_{11} ,a_{12} ,a_{13} ,a_{14} ,\dots \} ,$};
% Text Node
\draw (112,78.4) node [anchor=north west][inner sep=0.75pt]    {$A_{2} =\{a_{21} ,a_{22} ,a_{23} ,\dots ,\dots\} ,$};
% Text Node
\draw (112,113.4) node [anchor=north west][inner sep=0.75pt]    {$A_{3} =\{a_{31} ,a_{32} ,\dots ,\dots ,\dots \} ,$};
% Text Node
\draw (112,148.4) node [anchor=north west][inner sep=0.75pt]    {$A_{4} =\{a_{41} ,\dots ,\dots ,\dots ,\dots \} ,$};


\end{tikzpicture}

\end{document}